}

​

    detect(

      uniqueKey: string,

      callback: (error: Error, metadata: attached.StorageDetect.BootState, access: StorageAccess) => void) {

​

      if (!this._window.indexedDB) {

        callback(new Error('No indexedDB object exposed from window.'), null, null);

        return;

      }

​

      if (typeof this._window.indexedDB.open !== 'function') {

        callback(new Error('No open method exposed on indexedDB object.'), null, null);

        return;

      }

​

      var dbName = uniqueKey || 'teapo';

​

      var openRequest = this._window.indexedDB.open(dbName, 1);

      openRequest.onerror = (errorEvent) => callback(wrapErrorEvent(errorEvent, 'detectStorageAsync-open'), null, null);

​

      openRequest.onupgradeneeded = (versionChangeEvent) => {

        var db: IDBDatabase = openRequest.result;

        var filesStore = db.createObjectStore('files', { keyPath: 'path' });

        var metadataStore = db.createObjectStore('metadata', { keyPath: 'property' });

      };

​

      openRequest.onsuccess = (event) => {

        var db: IDBDatabase = openRequest.result;

​

        var transaction = db.transaction('metadata');

        transaction.onerror = (errorEvent) => callback(wrapErrorEvent(errorEvent, 'detectStorageAsync-openRequest.onsuccess-transaction'), null, null);

​

        var metadataStore = transaction.objectStore('metadata');

​

        var editedUTCRequest = metadataStore.get('editedUTC');

​

        editedUTCRequest.onerror = (errorEvent) => {

          this._proceedOpen(null, db, callback);

        };

​

        editedUTCRequest.onsuccess = (event) => {

          var result: MetadataData = editedUTCRequest.result;

        };

​

      };

​

    }

​

    private _proceedOpen(

      editedUTC: number,

      db: IDBDatabase,

      callback: (error: Error, metadata: attached.StorageDetect.BootState, access: StorageAccess) => void) {

​

      var transaction = db.transaction('files');

      transaction.onerror = (errorEvent) => callback(wrapErrorEvent(errorEvent, 'load: transaction'), null, null);

      var filesStore = transaction.objectStore('files');

      var cursorRequest = filesStore.openCursor();

      cursorRequest.onerror = (errorEvent) => callback(wrapErrorEvent(errorEvent, 'load: objectStore-openCursor'), null, null);

​

      var filenames: string[] = [];

​

      cursorRequest.onsuccess = (event) => {

        var cursor: IDBCursor = cursorRequest.result;

​

        if (!cursor) {

          var meta = { editedUTC: editedUTC, files: filenames };

          var access = new StorageAccess(db);

          callback(null, meta, access);

          return;

        }

​

        var result: FileData = (<any>cursor).value;

        if (result && result.properties) {

          filenames.push(result.path);

        }

​

        cursor.continue();

      };

    }

​

  }

​

}